季节冻土区梯形混凝土衬砌渠道冻胀预测研究.pdfVIP

水利水电技术第47 卷 2016 年第11 期 季节冻土区梯形混凝土衬砌渠道冻胀预测研究 张如意，姜海波 (新疆石河子大学水利建筑工程学院，新疆石河子 832仪)()) 摘 要:依据热传导和质量迁移理论，建立渠基冻土温度场、水分场和应力场搞合数学模型，分析了 影响季节冻土区渠基土体冻结的核心因素温度和水分运移量，提出以冻结期渠基土体温度和水分迁移 量为变量，建立渠基土体冻深和冻胀量预测模型。 借助于季节性冻融条件下梯形混凝土衬砌渠道原型 观测成果，观测了冻结期渠基以下5 cm 处土体温度以及水分迁移量，研究了季节冻融菜基温度和水 分运移及其诱发的冻深发展和冻胀变形的变化。经检验，预测曲线与实测曲线基本一致，且满足误差 要求，用冻结期土体温度和水分迁移量来预测冻深、冻胀的方法准确可行。 关键词:季节冻土;梯形混凝土衬砌渠道;冻深;冻胀预测 doi : 10. 13928/j. c咏i. wrahe. 2016. 11. 031 中图分类号: 5277 文献标识码:A 文章编号: 1000-08ω(2016)11-0147-06 Study on frωthea悦ng prediction of 仕apezoidal concrete lined canal in se凶onal frozen soil region ZHANG Ruyi , nANG Haibo (College of Water Conservancy and Architecture Engineering , 5hihezi University , 5hihezi 832仪泊， Xinjiang , China) Abstract: ln accordance with 由e 出eories of heat conduction and mass transfer , a coupled math-model of the soil temperature field , moisture field and stress field of canal foundation frozen soil is established , and then the key factors , i. e. temperature and water transfer amount , of the impac恼。n the soil freezing of the canal foundation in seasonal frozen soil r句ion are analyzed; from which it is proposed to establish a model for predicting both the frozen depth and the frost heaving of canal foundation soil by taking the temperature and water transfer amount of canal foundation soil as the variables. By mωns of the result from the proto- type observation made on the trapezoidal concrete lined canal under the condition of 能asonal freezing-thawing , the temperature and water transfer amount 5 cm below the canal foundation in freezing s饵son is observed , while the temperature and water trans- fer of the can